/*
 * Solo - A beautiful, simple, stable, fast Java blogging system.
 * Copyright (c) 2010-2018, b3log.org & hacpai.com
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
package org.b3log.solo.repository.impl;

import org.b3log.latke.Keys;
import org.b3log.latke.repository.*;
import org.b3log.latke.repository.annotation.Repository;
import org.b3log.latke.util.CollectionUtils;
import org.b3log.solo.model.Category;
import org.b3log.solo.model.Tag;
import org.b3log.solo.repository.CategoryRepository;
import org.json.JSONArray;
import org.json.JSONObject;

import java.text.Collator;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

/**
 * Category repository.
 *
 * @author <a href="http://88250.b3log.org">Liang Ding</a>
 * @version 1.1.0.2, Apr 19, 2017
 * @since 2.0.0
 */
@Repository
public class CategoryRepositoryImpl extends AbstractRepository implements CategoryRepository {

    /**
     * Public constructor.
     */
    public CategoryRepositoryImpl() {
        super(Category.CATEGORY);
    }

    @Override
    public JSONObject getByTitle(final String categoryTitle) throws RepositoryException {
        final Query query = new Query().
                setFilter(new PropertyFilter(Category.CATEGORY_TITLE, FilterOperator.EQUAL, categoryTitle)).
                setPageCount(1);

        final JSONObject result = get(query);
        final JSONArray array = result.optJSONArray(Keys.RESULTS);

        if (0 == array.length()) {
            return null;
        }

        return array.optJSONObject(0);
    }

    @Override
    public JSONObject getByURI(final String categoryURI) throws RepositoryException {
        final Query query = new Query().
                setFilter(new PropertyFilter(Category.CATEGORY_URI, FilterOperator.EQUAL, categoryURI)).
                setPageCount(1);

        final JSONObject result = get(query);
        final JSONArray array = result.optJSONArray(Keys.RESULTS);

        if (0 == array.length()) {
            return null;
        }

        return array.optJSONObject(0);
    }

    @Override
    public int getMaxOrder() throws RepositoryException {
        final Query query = new Query();

        query.addSort(Category.CATEGORY_ORDER, SortDirection.DESCENDING);

        final JSONObject result = get(query);
        final JSONArray array = result.optJSONArray(Keys.RESULTS);

        if (0 == array.length()) {
            return -1;
        }

        return array.optJSONObject(0).optInt(Category.CATEGORY_ORDER);
    }

    @Override
    public JSONObject getByOrder(final int order) throws RepositoryException {
        final Query query = new Query();

        query.setFilter(new PropertyFilter(Category.CATEGORY_ORDER, FilterOperator.EQUAL, order));

        final JSONObject result = get(query);
        final JSONArray array = result.optJSONArray(Keys.RESULTS);

        if (0 == array.length()) {
            return null;
        }

        return array.optJSONObject(0);
    }

    @Override
    public List<JSONObject> getMostUsedCategories(final int num) throws RepositoryException {
        final Query query = new Query().addSort(Category.CATEGORY_ORDER, SortDirection.ASCENDING).
                setCurrentPageNum(1).setPageSize(num).setPageCount(1);

        final JSONObject result = get(query);
        final JSONArray array = result.optJSONArray(Keys.RESULTS);

        final List<JSONObject> ret = CollectionUtils.jsonArrayToList(array);
        sortJSONCategoryList(ret);

        return ret;
    }

    @Override
    public JSONObject getUpper(final String id) throws RepositoryException {
        final JSONObject category = get(id);

        if (null == category) {
            return null;
        }

        final Query query = new Query();

        query.setFilter(new PropertyFilter(Category.CATEGORY_ORDER, FilterOperator.LESS_THAN, category.optInt(Category.CATEGORY_ORDER))).
                addSort(Category.CATEGORY_ORDER, SortDirection.DESCENDING);
        query.setCurrentPageNum(1);
        query.setPageSize(1);

        final JSONObject result = get(query);
        final JSONArray array = result.optJSONArray(Keys.RESULTS);

        if (1 != array.length()) {
            return null;
        }

        return array.optJSONObject(0);
    }

    @Override
    public JSONObject getUnder(final String id) throws RepositoryException {
        final JSONObject category = get(id);

        if (null == category) {
            return null;
        }

        final Query query = new Query();

        query.setFilter(new PropertyFilter(Category.CATEGORY_ORDER, FilterOperator.GREATER_THAN, category.optInt(Category.CATEGORY_ORDER))).
                addSort(Category.CATEGORY_ORDER, SortDirection.ASCENDING);
        query.setCurrentPageNum(1);
        query.setPageSize(1);

        final JSONObject result = get(query);
        final JSONArray array = result.optJSONArray(Keys.RESULTS);

        if (1 != array.length()) {
            return null;
        }

        return array.optJSONObject(0);
    }

    private void sortJSONCategoryList(final List<JSONObject> tagJoList) {
        Collections.sort(tagJoList, new Comparator<JSONObject>() {
            @Override
            public int compare(final JSONObject o1, final JSONObject o2) {
                return Collator.getInstance(java.util.Locale.CHINA).
                        compare(o1.optString(Tag.TAG_TITLE), o2.optString(Tag.TAG_TITLE));
            }
        });
    }
}
